package com.xiu.concurrency;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SimplePriorities implements Runnable{
	private int countDown=5;
	private volatile double d;
	private int priority;
	
	public SimplePriorities(int priority) {
		this.priority = priority;
	}
	
	@Override
	public String toString() {
		return Thread.currentThread()+":"+countDown;
	}
	
	@Override
	public void run() {
		Thread.currentThread().setPriority(priority);
		while(true){
			for (int i = 0; i < 100000; i++) {
				d+=(Math.PI+Math.E)/(double)i;
				if(i%1000==0)
					Thread.yield();
			}
			System.out.println(this);
			if(--countDown==0) return;
		}
	}
	
	public static void main(String[] args) {
		ExecutorService exec = Executors.newCachedThreadPool();
		for (int i = 0; i < 5; i++) {
			exec.execute(new SimplePriorities(Thread.MIN_PRIORITY));
		}
		exec.execute(new SimplePriorities(Thread.MAX_PRIORITY));
		exec.shutdown();
	}
}
